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- Path: sourcery.han.de!not-for-mail
- Newsgroups: comp.sys.amiga.programmer
- References: <Pine.SOL.3.91.960114184921.17616C-100000@ns1> <4del92$ajj@serpens.rhein.de>
- From: "Olaf Barthel" <olsen@sourcery.han.de>
- Date: Tue, 16 Jan 1996 16:04:53 +0100
- X-NewsReader: IntuiNews 1.3a (7.9.95)
- Subject: Re: Amiga Memory Map Needed!!!
- Message-ID: <13213474@sourcery.han.de>
-
- In Article <4del92$ajj@serpens.rhein.de>, Michael van Elst <mlelstv@serpens.rhein.de> wrote:
- > StarBlazer <starblaz@postoffice.ptd.net> writes:
- >
- > >Anyone know of anywhere on the 'net where I can get a half-decent Amiga
- > >memory map.
- >
- > I just have the fully decent map:
- >
- > $4 pointer to ExecBase
-
- Correct, but that doesn't explain much to somebody who apparently knows
- very little about how the Amiga works and why a memory map won't help much
- in programming it.
-
- So Jess, if you're reading this:
-
- 1) The Amiga is no big C64 in which no operating system layer provided
- access to the hardware resources. A memory map might tell you the
- locations of hardware registers, but no thourough explanation how
- the damn thing works, let alone any guarantee that you will find
- writable and readable memory at specific addresses. Unlike the C64
- memory configurations vary widely between different Amigas.
-
- 2) Although it might be feasible to design software based upon the
- hardware description only, it is effectively discouraged. You cannot
- avoid the operating system altogether. Even if you choose to ignore
- it chances are that your software will get into conflict with it.
- Also, there is no documented bare-bones approach to find out exactly
- which hardware is installed in the Amiga your software is about to
- run on. What you may design for an A1200 will break on an A3000
- without you knowing why it failed.
-
- The only path you can travel that doesn't make you stop because of these
- obstacles is in following the operating system.
-
- --
- Home: Olaf Barthel, Brabeckstrasse 35, D-30559 Hannover
- Net: olsen@sourcery.han.de
-